Perched atop Portland’s historic City Hall built in 1895, this green roof retrofit blends ecological function with civic symbolism. Designed to meet structural constraints and earn approval from the Historic Landmarks Commission, the roof features a thin-profile soil system planted with drought-tolerant sedums and bulbs that shift color with the seasons. Its symmetrical design balances simplicity with visibility—framing a lush foreground to the Portland Building and offering striking views from surrounding towers.

As part of an architect-led renovation, the landscape team developed low-maintenance, high-impact planting strategies that reduce stormwater runoff, support habitat, and extend roof life. The project illustrates how thoughtful landscape design can quietly elevate sustainability, aesthetics, and public perception—especially when layered onto a landmark.

As a Senior Landscape Architect with Mayer/Reed, Tim Strand was project manager and design lead for this project.

Mayer/Reed Team: Carol Mayer-Reed, Tim Strand, Joanna Schwartz